Temperature Dependence of the Quadrupole Interaction for 111In in Sapphire
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Perturbed angular correlation measurements of the hyperfine interaction of 111In in sapphire show, that after implantation and annealing at 1000°C, the fraction of undisturbed probe atoms exhibiting a unique quadrupole interaction with ν Q = 219(1) MHz (η = 0) varies between 50% at 4 K, 5% at 100 K and 80% at 973 K in a reversible manner. A possible explanation for this surprising behaviour is the influence of so-called ‘after effects’ following the EC-decay of 111In to 111Cd. Immediately after the decay the 111Cd is in an ionized state, then collects electrons from its surroundings and reaches the ground state. The different electronic configurations that arise during this relaxation process affect the amplitude (f u) and the damping (δ u) of the unique quadrupole interaction.
KeywordsQuadrupole Interaction Perturb Angular Correlation Probe Nucleus Perturb Angular Correlation Spectrum Angular Correlation Measurement
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